SRPP GAIN STAGE
The passive filter section of the PQ2 is based on the Pultec EQP1, but i is not a clone as much as a development of the circuit.
The active gainstage is an SRPP vacuum tube design, that was also worked into an earlier "trafos and tubes" colourbox design.
It pairs perfectly with the character of the filter.
The unit is carefully matched and calibrated for stereo tracking, and everything is on switches for perfect matching and recall.
The mastering optimized design also features a narrowed low-end boost and cut adjustment range, so you can do more subtle work in that end of the spectrum.